Question

我需要向渲染模板行中的html页面发送一些数据。我不认为该行甚至可以在该方法的POST版本中执行，因为我可以更改html页面并且它根本不会更改，但是如果我在普通的非POST版本中对其进行更改，则会使事情搞砸。

这是线路不在其中运行的方法

@bp.route('/livechat', methods=('GET', 'POST'))
def livechat_post():
    if request.method == 'POST':
        user_id = session.get('user_id')
        db = get_db()
        if user_id is None:
            return redirect(url_for('auth.start_page'))
        else:
            user = db.execute(
                'SELECT * FROM user WHERE id = ?', (user_id,)
            ).fetchone()
            if user is None:
                return redirect(url_for('auth.start_page'))
            user_details = {
                'email': user['email'],
            }
            print (request.form['flag'], file=sys.stderr)
            print ('flag 0', file=sys.stderr)

            #the first ajax call for creating the conversation
            otherEmail = request.form['otherEmail']
            reversed = True
            concat_users = user_details['email'] + ":" + otherEmail
            concat_reverse = otherEmail + ":" + user_details['email']

            #check to see who started the conversation
            check_dup  = db.execute(
                'SELECT * FROM total_msg WHERE identifier = ?', (concat_reverse,)
            ).fetchone()

            if check_dup is None:
                reversed = False
                db.execute(
                    'INSERT OR IGNORE INTO total_msg (identifier, total_messages) VALUES (?, ?)', (concat_users, 0,)
                )
                db.commit()
            # the second ajax call for entering a message into the database
            if request.form['flag'] == '1':
                #adds 1 to the conversation message count and enters the message
                print ('flag 1', file=sys.stderr)
                if not reversed:
                    hack = db.execute('SELECT * FROM total_msg WHERE identifier = ?', (concat_users,)).fetchone()

                    db.execute(
                        'INSERT OR REPLACE INTO total_msg (identifier, total_messages) VALUES (?, ?)', (concat_users, hack['total_messages'] +1,)
                    )
                    db.commit()

#                    concat_users_msgnumber = concat_users + ":" + str(hack['total_messages'])
                    db.execute(
                        'INSERT INTO messages (id, identifier_msg_nmbr, message, sender) VALUES (?, ?, ?, ?)', (hack['total_messages'], concat_users, request.form['the_message'], user_details['email'],)
                    )
                    db.commit()
                else:
                    hack2 = db.execute('SELECT * FROM total_msg WHERE identifier = ?', (concat_reverse,)).fetchone()

                    db.execute(
                        'INSERT OR REPLACE INTO total_msg (identifier, total_messages) VALUES (?, ?)', (concat_reverse, hack2['total_messages'] +1,)
                    )
                    db.commit()

#                    concat_reverse_msgnumber = concat_reverse + ":" + str(hack2['total_messages'])
                    db.execute(
                        'INSERT INTO messages (id, identifier_msg_nmbr, message, sender) VALUES (?, ?, ?, ?)', (hack2['total_messages'], concat_reverse, request.form['the_message'], user_details['email'],)
                    )
                    db.commit()

            if not reversed:
                print ('if', file=sys.stderr)
                chat_history = db.execute(
                    'SELECT * FROM messages WHERE identifier_msg_nmbr = ?', (concat_users,)
                ).fetchall()
#                print (chat_history, file=sys.stderr)
            else:
                print ('else', file=sys.stderr)
                chat_history = db.execute(
                    'SELECT * FROM messages WHERE identifier_msg_nmbr = ?', (concat_reverse,)
                ).fetchall()
            print (chat_history, file=sys.stderr)

            return render_template('main/livechat.html', user=user_details, chat_history=chat_history)

这是即时消息如何使用html中的数据

<div class="row">
<div class="col s4">
<h6 class="bold">messages</h6>
</div>
</div>
{% for item in chat_history %}
<div class="row">
<div class="col s4">
<p>{{item.message}}</p>
</div>
</div>
{% endfor %}

Answer 1

在烧瓶路径中，如果POST块，所有代码都位于内部。首次加载页面时，方法为GET。没有处理这种情况的例程。

在您的html模板中，没有表单。因此，我想没有办法使用POST提交数据。因此，例程永远不会遇到POST方法。

这全部基于您共享的代码段。

我要这样做的方式如下-

@bp.route('/livechat', methods=('GET', 'POST'))
def livechat_post():
    if request.method == 'POST': 
        #various logic, code here for the cases when method is POST
        return redirect(url_for('somepage'))

    elif request.method == 'GET':
        #codes for the situations when method is GET
        #also pass form if form is submitted for the POST method in render_template
    #other logics
    return render_template('main/livechat.html', user=user_details, chat_history=chat_history)

Flask中的render_template返回未在使用POST和GET的方法中运行

1 个答案: